If it was ME, I'd go over and help her as soon as the opportunity presented itself, but it would be like this.
-What's the problem?
-Fix the problem
-Leave and let her know she can call you if she needs help again
No friendly chit-chat at all. If and when she questions your attitude, THEN you tell her that you came over to help her as a "Friend" would. BUT, as a "Friend" you're hurt about what she did to you.
Leave it at that. My guess is she'll apologize because SHE made a mistake and did unfairly take it out on you.
If the next time she calls, she wants to go for drinks, or whatever you used to do, go and have a good time. Let her apologize in time.
If the next time she calls, it's to fix her computer again THEN go over at your convenience.
